Modern family: Women, children linked by same donor

Marianne, Emily, Meredyth and Dana were once strangers but are now a big family after the same sperm donor fathered their kids.
3:17 | 02/26/20

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Transcript for Modern family: Women, children linked by same donor
Now to the story of how four in four different states all connected by one common thread went from being strangers to one big, happy family. Paula Faris is here with the story. They're one very big happy these women all have the same sperm donor. They call their kids diblings or donor siblings and see each other at least once a year. Four women, four different states linked by one thing, they all share the same sperm donor. Mary Anne, Emily, Meredith and Dana. All strangers with nine children between them, fathered by the same donor and now they're a family that could only exist in the 21st century including gabby and laurel who look almost identical. It's a story that first appeared in glamour.com. A mutual friend put me in touch with Meredith and what I found fascinating she started out doing this for her daughter. What she wound up finding was this ad hoc sisterhood that she never knew she needed. Reporter: They found each other on the donor sibling registry, a site where you can volunteer to connect wh others who share your donor and Mary Anne was the first to reach out. I wanted my kids to always know their family, family is always been the most important thing to me. I think it's kind of like a new family of choice in a way. Reporter: Over the years all four families have slowly connected. I thought it was really important that this not be something scary or foreign to gabby, that it be just part of her story she always knew and celebrate. When people hide these things from their children, they're casting shame on their conception. Reporter: It was the shock of a lifetime when Meredith saw a photo of Emily's daughter laurel who is the spitting image of her own daughter gag. I thought someone was playing a joke on me. I wasn't really looking for a connection until I saw the photo and then I realized that I could pretend all I wanted, it wasn't really about me. It was about them. Seeing that picture, though, I mean, all I could tell you is I texted it immediately to every member of my family and they all wrote back, cute. Where were you? They had no idea that it wasn't gabi. No. Reporter: This modern family coming together for the first time in 2014. In the past 20 years U.S. Donor conceived births are as high as 2 million prompting more and more of these kinds of new families. It was just this kind of heartstring pull because you could see your kid in those faces. It was just wild. It was all about the kids getting to know each other and the other parents loving my kids. We all love our kis then it was like, oh, there's more to love. As you heard, big applause from our audience. They felt they owed it to the kids to be in one another's lives. As for why they all chose the same donor, they loved his Italian heritage but he's also willing to be known which in the donor circles means he's willing to meet all of the kids when they turn 18. Wow. It's a family of choice as they said. I can't believe how those kids looked alike. Thank you have so much. When we come back the

This transcript has been automatically generated and may not be 100% accurate.

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